Which BL point is located 1.5 cun lateral to the lower border of the spinous process of L3?

Which BL point is located 1.5 cun lateral to the lower border of the spinous process of L3?

• A. BL23
• B. BL24
• C. BL25
• D. BL22

Answer: (B)

Understanding where Bladder back Shu points lie relies on matching the vertebral level with a fixed 1.5 cun lateral offset from the spinous process. For the third lumbar vertebra, the corresponding Bladder back Shu point is located 1.5 cun lateral to the lower border of the L3 spinous process. That point is the Bladder back Shu at L3, known as BL24 (Qi Hai Shu). The other back Shu points along these levels sit at adjacent vertebrae—BL23 at L2, BL25 at L4, and BL22 at L1—so they do not correspond to the L3 level. To locate BL24 in practice, identify the L3 spinous process, note its lower border, and move 1.5 cun laterally along the Bladder channel.

Understanding where Bladder back Shu points lie relies on matching the vertebral level with a fixed 1.5 cun lateral offset from the spinous process. For the third lumbar vertebra, the corresponding Bladder back Shu point is located 1.5 cun lateral to the lower border of the L3 spinous process. That point is the Bladder back Shu at L3, known as BL24 (Qi Hai Shu). The other back Shu points along these levels sit at adjacent vertebrae—BL23 at L2, BL25 at L4, and BL22 at L1—so they do not correspond to the L3 level. To locate BL24 in practice, identify the L3 spinous process, note its lower border, and move 1.5 cun laterally along the Bladder channel.